A Wheatstone bridge has arms of resistance 1, 2, 3,
and 4 ohm. A galvanometer of resistance 5 ohm is
connected to the junctions of 1 and 4 ohm coils and of
2 and 3 ohm coils. A 2 volt accumulator of negligible
resistance is connected to the other two junctions.
Calculate the current through the galvanometer.
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